Chess Problem Database ServerThis chess problem database has been developed and is maintained through volunteer work of a lot of benevolent contributors, who spent their time and energy in the interest of the chess problem community.Category: DatabaseAdded by: Administrator (December 27th, 2013)http://pdb.dieschwalbe.de/index.jspSite Rating: 4.24

Composers' Names in Various AlphabetsThe tables on the pages of this site contain writings of composers' names in their own alphabet using some standard transliterations and transcriptions in some widely used and/or large collections.
In addition, you'll find :
- his/her country (e.g. the country for which (s)he would contribute in the WCCT) as an ISO 3166-1 alpha-3 code;
- his/her date of birth (if known) and date of death (with the obvious restrictions).Category: DatabaseAdded by: Administrator (April 8th, 2015)http://database.wfcc.ch/index.php?-table=composersSite Rating: (n/a)

SuperProblemКОНСТРУКТИВНЫЙ ПОЗИТИВ - This site brought various novelties, the most popular being QCT's -
not less than 100 during the first two years!Category: ComposingAdded by: Administrator (January 4th, 2019)http://superproblem.ru/index.htmlSite Rating: 4.71

Popeye - Chess Solving ProgramPopeye is a free chess solving software and one of the best solving programs.
By itself, Popeye has no graphical interface, but it can be used in DOS, Windows, Linux, MacOS...
It can solve problems with many fairy pieces and conditions.
(Olive is an interface for Popeye.)
Category: Software &DatabaseAdded by: Administrator (August 3rd, 2019)https://github.com/thomas-maeder/popeye/releases/Site Rating: 4.43

Harmonie HomepageThis German magazine features only helpmates, selfmates and fairies. Its site has an interesting page, dedicated to the awards status, where the awards are available in pdf form. Category: MagazineAdded by: Eric Huber (March 2nd, 2019)http://www.problemschach.de/harmonie/Site Rating: 4.21

Thorsten Zirkwitz - My Problem Chess Pages"With these pages I would like to present a selection of my chess problems to a wider audience. This site is mainly targeted at advanced problemists who already own comprehensive knowledge of themes and ideas in problem chess..."Category: PersonalAdded by: Administrator (November 5th, 2015)http://home.versanet.de/~zirkwitz/Site Rating: 3.50